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Old 12-09-2012, 08:36 PM   #1
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Overheating problem HELP!!!

i just did a coolant flush, and changed the thermostat, now my jeep has nice fresh coolant in it. I did all this because my jeep was over heating on the highway and was running warmer than usual when driving around. But after all this it seems to have made no difference to the running temperature, ever since ive had it, it would run 205-210 but now its around 220 and overheats on the highway. Anyone know of what might be the issue???

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Old 12-09-2012, 08:39 PM   #2
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reverse flush radiator backwards htough fins toward front.

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Old 12-09-2012, 08:43 PM   #3
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210 is normal operating temperature for these things. Just to clarify, are you saying it's now running 220 since the flush? If that's the case you may just have some air still in the system.
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Old 12-09-2012, 08:47 PM   #4
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i know 210 is normal, its just when i get on the highway it gets really hot near overheating
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Old 12-09-2012, 09:04 PM   #5
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Ok. So, the thermostat is already covered. If you're not experiencing any mysterious coolant loss or signs of water in the oil, then I'd suspect a possible problem with flow through the radiator... either coolant flow or air flow. Excessive dirt, mud, ect in the fins or the typical crud that builds up in the flues over time & miles can reduce the radiator's cooling capacity, and this will usually show up at highway speeds or under load.

I don't see any reason to suspect the fan clutch at this point because fan clutch problems will usually show themselves at idle or in slow traffic.
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Old 12-09-2012, 11:22 PM   #6
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I have to disagree with the fan clutch not being the problem . If the fan has stop working or started to break down then even during highway driving it wouldnt be able to pull enough air through the rad. If you are not losing any water , I would look for dirt between the condenser and the rad. if it is clean, then move to the fan , you have already changed the thermostat and did a flush. You can also be having issues with the impeller on the water pump. I have had one almost completely deteriorate on a 02 wrangler x . Ran hot all the time but never overheated . I did all the same stuff you did and the water pump was the last straw before i sold it . Turned out it was the pump . If you are losing water but no visible leaks i would have the system pressure tested to see if you have a head gasket issue .. Good luck ..
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Old 12-09-2012, 11:51 PM   #7
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Check it with a master gauge to make sure that is is really over heating and not just a gauge, or sending unit issue.
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Old 12-10-2012, 12:05 AM   #8
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Perhaps its as simple as the radiator cap leaking?
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Old 12-10-2012, 12:18 AM   #9
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yeah, sometime, its just when i get on the highway it gets really hot near overheating,thanks
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Old 12-10-2012, 12:22 AM   #10
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Quote:
Originally Posted by InvertChaos View Post
Perhaps its as simple as the radiator cap leaking?
or a bad cap .. this will not let system pressurize and cause a low boil point and overheating .. no matter how you are driving .

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